The main thing is that the players giving hints shouldn't see the layout from the opposite side – they should be punished for that with a candelabra.

Otherwise, let them give hints; it's part of the communication (especially if it's done in a teasing way), and it can also improve skills – the opponent can also learn something interesting for themselves based on the nature of the hints.

Of course, we will deal with particularly annoying hint-givers, but it's impossible to keep track of every little hint, so I don't see any point in banning them altogether.